Add code for respective topics

[Nitesh-thapliyal]

• First create a programming language folder if not exist
• Create subfolders for topics like sorting, recursion, etc.
• Add your code sub folder

[atamakahere-git]

I would like to work on this issue under hacktober fest
Things that I'll do :

• Add quicksort in C++/DSA/sorting
• Add shellsort in C++/DSA/sorting
• Add Sieve of Eratosthenes in C++/DSA/Mathematical_Algo

[t-nishq]

I would like to work on this issue under hacktoberfest
Things that I'll do :

-Add pyhton/hackerrank/Designer door mat
-Add pyhton/hackerrank/2D Arrays
-Add pyhton/hackerrank/List Comprehensions
-Add pyhton/hackerrank/Class vs. Instance

[adityamangal1]

@tanveerraza789 and @yoursauce go ahead 🙂